Add bash completion for `docker service ps --filter node`

Signed-off-by: Harald Albers <github@albersweb.de>

contrib/completion/bash/docker

@@ -2710,11 +2710,15 @@ _docker_service_ps() {
 			__docker_complete_services --cur "${cur##*=}" --name
 			return
 			;;
+		node)
+			__docker_complete_nodes_plus_self --cur "${cur##*=}"
+			return
+			;;
 	esac
 
 	case "$prev" in
 		--filter|-f)
-			COMPREPLY=( $( compgen -W "desired-state id name" -S = -- "$cur" ) )
+			COMPREPLY=( $( compgen -W "desired-state id name node" -S = -- "$cur" ) )
 			__docker_nospace
 			return
 			;;